Telephone call transmitter



Feb. 12, 1946. R. F. MALLINA TELEPHONE GALL TRANSMITTER 3 Sheets-Sheet 1 Filed. NOV. 30

lFla/ T /NVENTOR y ,4 M00 M m M w/W ma B 'ATTORNEY R. F; MALLINA TELEPHONE CALL '.UUISMITTERv 3 Sheets-Sheet 2 Feb.- 12, 1946.

Filed NOV. 30, 1944 Arron/ver l Feb- 12, 1946- R. F. MALLINA v TELEHONE CALL TRANSMITTER Filed Nov. 5o, 1944 s sheets-sheet 5 /Nl/ENTOR. REMALL/NA En?. @MMA .Arme/viv .;oontrolled3thereby in the operated.position;

Patented Feb. 12, 1946 TELEPHONE' CALIFTRAN S-MITTER iBudQlph-'Fe-Mallina Hastingson-I[ndsomv NQY.,

assigner to elllelephone Laboratories, ,Incor- `vporated, NewYork, N. Y.,.a corporation oi-'New V.York

,'.ApplicationLNov-ember 30,.11944r-SerialNo.565905 6. Claims.

This invention relates to callvtransmitter'de- `vices? of the type usedVineautomatictelephone -isystemsffor establishing talking connections.-

i'Ihe object ofthe inventionistheprovision of av call transmitter device ofthe type above rev-erred -to' which will be simple in construction, `rconvenient-in use and positive inV operation.

j-In`` the call transmitter device of this invention,

- asetA ovfpivovted key members, representing digits, is providedforftensioning respectively associated motor springs having one of theiry ends attached -jtoL means carried bythe keys, and theiropposite ends to cords or wires coiled ondrums, f or rotating these drums and lclock escapement Wheels securedthereto upon the release of these Wheels .lasje'iected by means in theform of a common .pawl bar actuated by a U-shaped bar, itself un- .der.contro1 of the operated key member.

, VSpring actuatedmeans is providedfor ,engag- `ingrneans carried by the depressedkey for lock- V:ing this keyin the operated positionwhile positioning ananchor member pivoted thereon in operative .relation with the escapement wheel lassociated with that key for. operating a bar comirig'the other keys in the*non-operatedilosition for preventing theoperation of the latter during the operation of the pulsing mechanism. yA disc 4:Jimi/able with each drum and its associated .-eScapement wheelis provided with a cam element engaging means carried by the spring actuating .means for moving the latter in position forrealeasing the .operated key and moving the anchor .member carried thereby out of engaged relation y-rfromitsV associated escapement Wheel forcentrolling the operation of the pulsing contact, the

operatedkey .returning to vnormal non-operated position .by the tensionA of .its .own retractile spring.

Other novel features and advantages of the l 1invention.'will appear. from the following `descripv tionand bythe claims appended thereto, refer- -encebeing had to-.the accompanying drawings vint-which:

Fia l-,isaleft side elevation view, the casing housing the .transmittermechanism being shown partly in vertical longitudinal section and the I .keys in normal position;

.Fig.;2fis a-view .similartoFig Lbut showing one. of ithezkeys .and a vnumber-of operating parts *Figf is a partial plan viewshown-,with a number of f operating parts4 inl horizontal section;

JFigMl--is a-partial View shown with a number of operating-partsfin section taken4 onlinecll-- Fig 5 r.isla partial View of anescapement -mechanismflshowing its operated key :andA the mounting basev for.v the transmitter mechanism in vertical section taken on line `5-5. of Fig.. 2;

Fig-.r6 isa view similar .td-Fig.` 4 but kshowing rone-of the keys andthe latchvrassociatedtherewith-in `position. following the operation ofthe pulsingmechanismand the release of theoperated keyby its cam actuating-.mechanismpand Fig. 7: is anA elevation viewaof .the completed Y deviceshownl in perspective.

vReferringto the drawings, abase iiis provided -for Amounting a 4plate fi Iy .having Yupright extending arm .portions l2 and 'I3 servingffor .supporting ashaftisli .andvon .thisslfiaft is 'mounted asset cf key. members :Kl K2, ,K3,';K4,

K5, K6, K1, K8, K9` and l'Killhaving-their.free

end l portions extending through .an-` opening VOP best seen in:.liigs. 4 and 6,v inan upright extendmemberslKL 4K2, K3, etc., being normally held .innormal position .againstetheibar i5 formed at ing portion l"lfformedwith theplate ll,- the key l:the-top end of Lfthe.- upright portion .i 5. by the'tension of similar .fretractile .springs il `slitwn in Figs. l, 2.and:3.

The key members. Kl .K2 etc... are `locked individuallyiin their operated-position` as;Y shown vv.byf-key- KI in1Figs.-.2 and' 4 by similar respective arms lvhaving .ratchet .toothed portions 19;. at

their .upper `ends engaging pins-"26 carried vby. their respectively associated keys. The arms l@ as best seen inFigsl, 2, 4 andy 6, are pivoted cn a commonshaft vZigsupportedat .both ends in bearing portions 22 formed with the plate Il and are moved inrengagementwith their respectivepins 20 bythe normal 4 tension of. similarpsprings 23 ysecured to'theuprightextending portion i5 of t plate` 1I I following the individual v.move-ment. of Y. their respectively associated -keys to .operated position.

' The upright extending portion l5 of plate! i is formed with-two similar bearing portions 6l provided lfor pivotally mounting a pawl bar :521 disposed transverse. ofthe keys and movable under the ltension of a coiled spring .GS in the path or engagement With lugsiili carried by the key meinbers KlfrKZ; K3, etc., forv locking the vnon-operatedkeysv-in normal -.positicn, .the movement of thea pivoted zbar: 162 being I.eiected :.under :control ,.55w'of. arpivoted lui-shaped. band-lt. Aitself .actuatedsby while the disc 23 of each unit thus formed isv provided with a drum element 3U on which is coiled a cord or piano wire 3| having one of its ends hooked to a motor spring 32, the latter having its opposite end connected to the downward extending arm 33 of its respectively associated key while the opposite end of cord 3| is hooked movement o1.' arm I8 is effective to position the anchor member 24 mounted thereon in operative relation with its respective escapement wheel 26 which occurs in timed relation with the engagement of projection 31 formed with bar 36 with the arm 38 of the pivoted bar 39 for releasing the one toothed ratchet wheel 21 and thereby perto the end of a retractile spring 34 having its l opposite end hooked to a support 35 secured to the base I6 as by a number of screws HC shown in Fi-gs. 1, 2 and 3.

The operation of any one of the key members KI, K2, K3, etc., is effective to impart a correspending angular movement to the U-shaped barV 36 against the tensionof a retractile spring RS.

The movement of this bar in turn causes the pivotal movement of pawl bar 62 from the position shown in Fig. 1 to the position shown in Fig. 2 for locking the non-operated key in that position while the movement of U-shaped bar 36 is effective to engage a downwardly extending projection31 carried thereby with an arm 33 formed with a bar 33 pivoted on shaft 2|. The bar 39 is formed with a ridge 46 extending transverse of the one toothed ratchet wheels 21 to serve for individually holding these wheels in normal position during the tensioning of their respective motor springs 32 by the operation of their respectively associated keys, the bar 39 being returned to the engaged position with ratchet wheels 21 following the return of the operated key "and the bar 36 to normal position by the normal tension of a spring 4 I. Y

Each anchor member 24 is provided with an arm 42 disposed in operative relation with a bar 43 having arms as AI and A2 pivoted on supn ports 44 and 45 best seen in Figs. 1 and 2. Bar 43 is disposed in engageable relation with a spring 46 which cooperates with a spring 48 to form a normally closed pulsing contact 41, these springs being securely mounted in a pile-up arrangement on the U-shaped support 35.

One arm of U-shaped bar 36 is provided with a projection 5I, best seen in Figs. l, 2, 3 and 4, carrying a stud 52 of insulating material disposed in operable relation with a set of contacts CI and C2 provided to perform switching operations well known in the automatic telephone art but which form no part 0f the present invention. Y

In the operation of the cell transmitter of this invention, the operation of any key member as key KI, for example, from the position shown in Fig. 1 to the position shovvn in Fig. 2 is effective to impart a corresponding movement t0 the U-shaped bar 36 against the tension of its retractile spring RS while tensioning the motor spring 32V hooked thereto due to the one toothed ratchet wheel 21 of the unit associated with that key, being prevented from rotation by the ridge 40 of bar 33. The operation of bar 36 to its full operated position causes the automatic pivotal movement of arm I3 under the tension of its spring 23 for engaging the pin 20 carried by that key and thereby holding the latter in the operated position as shown inV Fig. 2,7while the pivotal mitting the rotation of escapement wheel 26 of that unit and the consequent movement of its ranchor member 24 for operating the bar 43 and thereby opening the pulsing contact 41 once followed by the engagement of projection 29 of wheel 28 of that unit with the cam portion 66 formed with arm I8 for disengaging the latter 'from pin 26 of key KI and thereby moving the anchor member 24 as shown in Fig. 6 out of operable relation from its respectively associated escapement wheel 23, the disengagement of pin 20 by arm I8 permitting the return of this key to normal position under the tension of its own retractile spring I1.

Rotation of escapement wheel 26 under the tension of motor spring 32 and the consequent winding of the cord 3l on drum 36 during the pulsing operation is effective to tension the retractile spring 34 which in turn causes` the reverse movement of this unit to normal nonoperated position simultaneously with the return of the operated key to normal position when the ridge 46 of bar 33 under the tension of its retractile spring 4I reengages the one toothed ratchet wheel 21 oi all units and the transmitter mechanism is now in condition for the operation of a succeeding key,

The operation of key KI@ for transmitting ten pulses as another example is effected in a manner similar to that described in connection with key KI |lhe rotation of the unit associated with key KI6 is effective through the engagement of its pin PID shown in Figs. l and 2 to :move its associated arm I8 against the tension of its spring 23 and thereby the anchor member 24 carried thereby out of engagement from its escapement wheel 25 following ten complete oscillations of the anchor member 24 and that of contact 41, the operation of arm I8 releasing key KI] which is returned to normal position under the tension of its own retractile spring I1 in the manner as above described in connection with key KI to again prepare the transmitter mechanism for the operation of the succeeding key.

What is claimed is;

1. In a call transmitter, a set of key members, clock escapement mechanisms, each of said L mechanisms having an escapement wheel and an anchor member one for each of said key members, each of said mechanisms having a motor spring tensioned by the operation of its respectively associated key member, movable supports for said anchor members of said mechanisms normally in position wherein said anchor members are out of engagementfrom their respectively associated escapement wheels, normally tensioned spring elements for moving said supports under contro-l of said. key members in position for rendering the operation of said escapelment wheels eiective relative to said anchor members, said movable supports having means for locking their respective keys in the operated position, a pulsing contact actuated 'by the operation of any one cf said clock escapement mechanisms, and means actuated by said escapement mechanisms for releasing their operated keys following the operation of said pulsing contact.

2.*In a call transmitter, a set of pivoted key members, clock escapement mechanisms, one for each of said key members, each of said mechanisms comprising an escapement wheel and an anchor member normally disengaged from said escapement Wheel, a disc secured to said escape- .ment wheels for movement therewith, pivoted arms operatively associated with said key members for pivotally mounting said anchor members, means carried by each of said arms for engaging means carried by their associated key members for locking the latter individually in the operated position, the movement of each of said arms positioning its anchor member in operative relation with its associated escapement wheel, motorsfor actuating said escapement wheels to cause the operation of their anchor members, a contact actu-ated by the anchor member of each of said clock mechanisms upon theA operation of their respectively associated key members, each of said discs having means for actuating its respectively associated arm for moving the anchor member carried by this arm `in non-operated position relative to its associated escapement wheel for controlling the operation of said contact.

3. In a call transmitter mechanism, a set of key members, motor springs attached at one of their ends to means carried by said key members, a shaft, escapement wheels mounted for rotation on said shaft, a drum and a disc secured to each of said escapement wheels forming independent units therewith, one of said units for each of said key members, cords attached to the opposite ends of said motor springs and winding on the drums of said units for rotating them upon the operation of their respectively associated key members, an anchor member operatively associated with each of said escapement wheels, but normally out of operative relation therefrom, spring actuated supporting means operatively associated with each of said key members for positioning said anchor members in operative relation with their respectively associated escapement wheels, and a pulsing contact actuated by the individual operation of said anchor members upon the rotation of the operated unit by its respective motor spring, each of said discs having means for actuating its respectively associated spring actuated supporting means for moving its anchor member out of operable relation from its associated escapement Wheel for controlling thel operation of said pulsing contact.

4. In a call transmitter, a key member, a pulsing Contact, a shaft, a clock escapement wheel, a ratchet wheel, a disc and a drum secured to said escapement wheel for rotation as a unit on said shaft, a motor spring, a cord coiled on said drum and having one of its ends connected to one end of said motor spring and its other end to said key member, a pivoted pawl bar normally engaging said ratchet wheel for holding said unit against movement upon the tensioning of said motor spring by said key member, means actuated by the movement of said key for operating said pivoted pawl bar for releasing said unit to cause the operation of the latter by the tension of said motor spring, spring actuated means operable for locking said key in the operated position, an anchor member carried by said spring actuated means positioned for engaging said escapement wheel upon the locking of said key, a pulsing contact actuated by the operation of said anchor member, and means carried by said key member engaging means carried by said spring actuated means for moving said anchor member in position ineffective relative to said escapement wheel and releasing said key, spring means for returning said key to normal position and a retractile spring tensioned by the operation of said motor-spring for returning said unit to normal.

5. In a call transmitter a set of key members, a pulsing contact, a supporting shaft for said key members, another shaft, a plurality of escapement wheels mounted for free rotation on said other shaft, one of said escapement wheels for each of said key members, a drum secured to each of said escapement wheels, an anchor member for each of said escapement wheels normally out of engagement therewith, movable supports for pivotally mounting said anchor members, means carried by said supports for individually locking said keys in the operated position and engaging said anchor members with their respectively associated escapement wheels, a cord coiled on each of said drums, a motor spring operatively connecting each of said key members to one end'of each of said cords coiled on said drums for individually rotating said escapement wheels upon the operation of their respectively associated key members for actuating said anchor members, means movable with each of said escapement wheels for actuating one of said pivoted arms for moving its respective anchor member away from its associated escapement Wheel for controlling the operation of said contact and simultaneously releasing the operated key member.

6. In a call transmitter, a base, a pulsing contact a set of key members, a shaft for pivotally supporting said key members, a U-shaped bar pivoted on said shaft and disposed for operation by the movement of any one of said key members, a retractile spring for said U-shaped bar, another shaft, a clock escapement wheel for each of said key members, a ratchet wheel, a disc and a drum secured to said escapement Wheels for movement as units therewith on the second-mentioned shaft, a cord wound around each of said drums, a motor spring for each of said units having one of its ends attached to one of the ends of said cords and their other ends to their respective key members, retractile springs secured to the other ends of said cords, and their other ends to supporting means mounted on said base, a pivoted pawl bar. `normally engaging the ratchet wheels of said units for preventing the operation thereof during the tensioning of their respective motor springs by the operation of their associated members, an

anchor element for each of said escapement wheels normally positioned out of operative rela.- tion therewith, means carried by each of said key members cooperating with means supporting said anchor elements for controlling the engagement of their respective anchor elements with their associated escapement Wheels, means carried by said U-bar engaging means carried by said pawl bar upon the operation of any one of said key members for operating said pawl bar for permitting the operation of the escapement wheel in the unit associated by the operated key by the tension of its motor spring for actuating said contact, means carried by the disc of the operated unit for moving its operated anchor member out of engaged relation with its associated escapement wheel for controlling the operation of said contact and releasing the operated key member.

RUDOLPH F. MALLINA. 

